﻿using System;
using System.Collections;

namespace ConsoleApp13
{
    class Program
    {
        static void Main(string[] args)
        {
            Stack stack = new Stack();
            stack.Push("第4单");
            stack.Push("第3单");
            stack.Push("第2单");
            stack.Push("第1单");
            Console.WriteLine("欢迎光临奶茶店");
            Console.WriteLine("出单");
            while (stack.Count != 0)
            {
                Console.WriteLine(stack.Pop());
            }
            
        }
    }
}
